SURFACE & SUBSEA SUPPORT BUOYS

—— EVERGREEN SURFACE & SUBSEA SUPPORT BUOYS

Low maintenance

Self fendering

Long service life

Easy handling and repair

SURFACE SUPPORT BUOYS

General surface support buoys are used extensively in single point mooring (SPM) systems, designed to withstand the severe & delicate operating conditions associated with offshore operations. Made out of closed cell PE/EVA foam, coated with resistant polyurethane skin ensuring the buoy will not absorb water even if the skin is damaged, increasing the life expectancy of the product and reducing the maintenance costs.

The main types of surface support buoys of Evergreen Maritime are:

Comparison of Different Types of Buoys

Type of Buoy	Structure Features	Application Range
Cylindrical Buoy	– Cylindrical shape, large size	– Navigation mark in waterways
	– High buoyancy and stability	– Mooring buoy for vessels
	– Can be equipped with lights, radar reflector, or AIS	– Signal or warning buoy
Chain Through Support Buoy	– Spherical or elongated body with central chain-through hole/pipe	– Supporting anchor chains and subsea pipelines
	– Strong load-bearing capacity	– Offshore mooring systems
	– Provides even force distribution	– Reducing wear on chains and cables
Pick-up Buoy	– Small,cylindrical, spherical or oval	– Marking the end of a rope or chain
	– Lightweight and easy to handle	– Easy retrieval of lines
	– Bright colors for visibility	– Temporary or auxiliary use

Features

EVERGREEN Surface Buoy structure

A. Closed cell resilient foam core, unsinkable design

General surface support buoys are made with highest quality closed-cell PE/EVA foam. This resilient foam makes the buoys self fendering with high absorption capacity. Even the skin was punctured, it is also unsinkable without absorbing water. With our unique laminating process, each foam core is integrited. The foam core will not be ruptured after long time service.

B. Tough nylon filament reinforced polyurethane skin

General surface support buoys’ skin is constructed of polyurethane elastomer which is reinforced with nylon filament. The polyurethane skin is the unique elastomer specifically used for offshore applications. Its high resistance to abrasion, fatigue and ultra violet degradation are significantly more durable.

C. Steel work and end assembly

Through central steel tube with longitudinal gussets and external load distribution flanges at each end, epoxy coated or hot-dipped galvanized, are encased in a closed-cell urethane foam central body. Optional pad eye, clevis eye, swivel, chain locking plate, single locking pin end fitting are available.

Regular size and performance

Cylindrical Buoys (YT-CB)

Type	Buoyancy (kg)	Length of body (mm)	Diameter (mm)	Weight in air (kg)
YT-CB1000	1000	1550	1080	375
YT-CB1850	1850	2000	1230	470
YT-CB2250	2250	2000	1340	500
YT-CB3200	3200	2000	1560	560
YT-CB3900	3900	2000	1705	605

Chain Through Buoys(YT-CTB)

Type	Buoyancy (kg)	Length of body (mm)	Diameter (mm)	Weight in air (kg)
YT-CTB1500	1500	2000	1195	520
YT-CTB2750	2750	2000	1505	630
YT-CTB3500	3500	2000	1680	750
YT-CTB4500	4500	2000	1900	880

Pick-up Buoys (YT-PUB)

Type	Buoyancy (kg)	Length of body (mm)	Diameter (mm)	SWL (tonne)	Weight in air (kg)
YT-PUB 90	90	665	515	1.2	42
YT-PUB 225	225	914	690	16	120
YT-PUB 400	400	914	900	16	155
YT-PUB800	800	914	1150	16	180

Evergreen buoys have been successfully applied in Victoria Harbour, Hong Kong

Subsea Support Buoys

SUBSEA SUPPORT BUOYS

Evergreen subsea mooring buoys are specialized flotation devices deployed beneath the ocean’s surface, typically at fixed depths. They provide critical buoyant support in systems requiring long-term, stable underwater positioning.

Application field

Advantages

Performance of subsea buoyancy material

Item	Unit	Value
Item	Unit	500 m	1000m	1500m	4500 m
Density	g/cm³	≤0.4	≤0.45	≤0.5	≤0.60
Compressive Strength	MPa	≥5	≥10	≥15	≥40
Hydrostatic Pressure	MPa	≥5	≥10	≥ 15	≥37
Water Absorption	%	<2 (5MPa,24h)	<2(10MPa,24h)	<2(15MPa,24h)	<2(40MPa,24h)